I think that was the intention behind https://darktable-css.danielepighin.net , but I’m not sure how easy it is to discover that site. I think it is maintained by @Masterpiga .
understood, you suggest a few, the next suggest further few, and who knows how many will also just suggets a few … then a dozen is reached quite fast 
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Yes, the site is still up. It seemed like something that people really wanted but then no one contributed, so it is stagnant.
I wonder if it would be worth puting a dedicated thread on this forum for themes. People could show a screenshot of their theme and share the css file. That may then avoid the need for maintenance and may be easier for users to find.
Well I doubt that it is easier to find… Yes, this forum is a more logical place to look, but a forum structure forum doesn’t lend itself very well to act as a repository.
Maybe it is my stupidity… but when visiting your site. .I don’t see an obvious way to contribute?
You create an account and then you can add stuff